CN113309613A - Gas leakage detection piece, gas leakage detection assembly, bleed air pipeline structure and aircraft - Google Patents

Abstract

The invention relates to the technical field of gas leakage detection, and discloses a gas leakage detection piece, a gas leakage detection assembly, a gas-guiding pipeline structure and an airplane. The gas leakage detection piece comprises a shell and a detection element, the shell comprises a gas collection cavity, an exhaust end is provided with an exhaust switch structure, the detection element extends into the gas collection cavity, and the exhaust switch structure comprises a closed state and an open state which is opened when the pressure of leaked gas in the gas collection cavity reaches a preset open pressure value. When the gas with small flow leakage flows into the gas collection cavity from the gas inlet end, the gas cannot be discharged to the external environment from the closed exhaust switch structure, the interference of the external environment on leakage detection is avoided, the gas collection cavity can guide the leaked gas to be stored in the gas collection cavity, the leaked gas entering the gas collection cavity is rapidly increased along with the leakage, the gas pressure in the gas collection cavity is increased, and the detection element can easily sense the leaked gas such as overheated gas, so that the sensing precision is improved, and the sensing time is shortened.

Description

Gas leakage detection piece, gas leakage detection assembly, bleed air pipeline structure and aircraft

Technical Field

The invention relates to the technical field of gas leakage detection, and discloses a gas leakage detection piece, a gas leakage detection assembly, a gas-guiding pipeline structure and an airplane.

Background

In the field of civil aircraft, the air supply system of a civil aircraft usually draws high-temperature and high-pressure air from the engine, and the high-temperature and high-pressure air is conveyed through an air-drawing pipeline. The bleed air line may leak under the influence of such high-temperature, high-pressure gas, which may adversely affect the structures and components of the aircraft in the region of the leak.

For this reason, various types of leak detection systems are commonly used in the prior art to detect leaks in the bleed air line. For example, a leak detection system is comprised of leak detection sensors, brackets, and hinge clips. After the bleed air pipeline leaks, high-temperature and high-pressure air can leak to the external environment from the heat insulating layer wrapped on the bleed air pipeline, and the leakage detection line of the leakage detection sensor determines whether leakage occurs or not by sensing the ambient temperature.

However, the various types of leak detection systems currently available can only be used to detect a large gas leak, i.e., only when a small leak at the beginning of the leak develops into a large leak. However, a gas leak at a small flow rate, for example, a gas leak at a small flow rate at the initial stage of the leak, cannot be detected accurately in time.

Disclosure of Invention

An object of the present invention is to provide a gas leakage detecting member capable of quickly and accurately detecting a gas leakage of a small flow rate.

In order to solve the technical problem, the invention provides a gas leakage detection piece, which comprises a shell and a detection element, wherein the shell comprises a gas collection cavity, the gas collection cavity comprises a gas inlet end and a gas outlet end, and the gas outlet end is provided with a gas outlet switch structure, the detection element extends into the gas collection cavity to be used for detecting leakage gas entering the gas collection cavity from the gas inlet end, and the gas outlet switch structure comprises a closed state and an open state which can be opened when the pressure of the leakage gas entering the gas collection cavity reaches a preset opening pressure value.

In the technical scheme, because the exhaust end of the gas collection cavity is provided with the exhaust switch structure, and the exhaust switch structure is opened when the pressure of the leaked gas entering the gas collection cavity reaches the preset opening pressure value, so that the gas leakage detection piece has the gas storage function in the practical use, namely, the exhaust switch structure is in the closed state, at the moment, the external air cannot enter the gas collection cavity, when the gas with small flow leakage starts to flow into the gas collection cavity from the gas inlet end, the gas cannot be discharged to the external environment from the closed exhaust switch structure, so as to avoid the interference of the external environment on the leakage detection, and the gas collection cavity can guide the leaked gas to be stored in the gas collection cavity, along with the leakage, the leaked gas entering the gas collection cavity is rapidly increased, so that the gas pressure in the gas collection cavity is increased, for example, the leaked overheated gas can be rapidly accumulated in the gas collection cavity to reduce the heat loss of the overheated air, at this time, the detection element extending into the gas collection cavity can easily sense the leakage gas such as the superheated gas, thereby improving the sensing precision and shortening the sensing time, and when the gas pressure is increased to the preset opening pressure value, the exhaust switch structure is opened to exhaust. Thus, the gas leakage detecting member can detect a gas leakage of a small flow rate quickly and accurately.

Further, the detection member passes through the exhaust switch structure and the exhaust end.

Furthermore, a support structure with an exhaust interval is arranged in the exhaust channel of the exhaust end, and the detection element penetrates through the support structure and is supported by the support structure.

Still further, the support structure includes radial ribs having a predetermined axial length, a plurality of the radial ribs are circumferentially spaced apart, a plurality of the radial inner sides of the radial ribs support the detecting element, and the exhaust space is formed between adjacent ones of the radial ribs.

In an alternative or further embodiment, the exhaust switch arrangement comprises an axially movable exhaust core, wherein the probe element passes through the exhaust core, the exhaust core being axially movable on the probe element to transition between the off-state and the on-state.

Further, the exhaust switch structure comprises an elastic piece, the exhaust core and the elastic piece are arranged in an exhaust channel of the exhaust end, and an exhaust port is formed on a channel wall of the exhaust channel, wherein in the closed state, the exhaust core cuts off the flow of the gas collection cavity and the exhaust port, and in the open state, the gas collection cavity and the exhaust port flow.

In addition, the internal size of the gas collection cavity is larger than that of the gas inlet channel of the gas inlet end.

In addition, the gas inlet end is used as a connecting and mounting part of the gas leakage detection piece.

In addition, the gas collection cavity comprises the exhaust ends which are arranged on the same axis at intervals, each exhaust end is provided with the exhaust switch structure, the detection element is a leakage detection line, and the leakage detection line extends into the gas collection cavity and extends out of the gas collection cavity.

In addition, the invention also provides a gas leakage detection assembly, which comprises a ventilation bracket and the gas leakage detection piece, wherein the ventilation bracket is arranged in a ventilation gap between the sleeved inner gas inlet pipeline and the outer heat insulation wrapping layer during assembly, the ventilation bracket comprises a bracket gas inlet communicated with the ventilation gap and a bracket gas outlet communicated with the bracket gas inlet, and the gas inlet end of the gas leakage detection piece is communicated with the bracket gas outlet.

As described above, with the gas leak detection member according to any of the above, the gas leak detection assembly can quickly and accurately detect a gas leak of a small flow rate from the internal gas supply line.

Further, the vent support includes a radially inner end in supporting connection with the inner vent line and a radially outer end in supporting connection with the outer insulating wrap when assembled, the support air inlet is formed on a side surface of the vent support, and the support air outlet is formed on an end surface of the radially outer end.

In addition, the gas leakage detection assembly comprises a gas guide tube with a turning corner, wherein a tube gas inlet of the gas guide tube is connected with a support gas outlet, and a tube gas outlet of the gas guide tube is connected with a gas inlet end.

Further, the air duct comprises a first duct body and a second duct body which are communicated, wherein a duct air inlet at one end of the first duct body is connected with the support air outlet, a duct side wall of the second duct body is connected with the other end of the first duct body to form a turning corner at a joint, duct air outlets which are located on two sides of the first duct body in the axial direction are arranged on the duct side wall of the second duct body, and each duct air outlet is connected with the air inlet end of the gas leakage detection piece corresponding to the duct air outlet.

In addition, the invention provides an air-entraining pipeline structure which comprises an inner air-entraining pipeline, an outer heat-insulating wrapping layer and any of the gas leakage detection assemblies, wherein the outer heat-insulating wrapping layer is sleeved outside the inner air-entraining pipeline, a ventilation gap is formed between the outer heat-insulating wrapping layer and the inner air-entraining pipeline, the ventilation bracket is arranged in the ventilation gap, and the bracket air-entraining port is communicated with the ventilation gap.

As described above, in the bleed air duct structure, the gas leak detection unit can quickly and accurately detect a small flow rate gas leak from the internal bleed air duct by the gas leak detection member described in any of the above.

Finally, the invention provides an aircraft comprising the bleed air duct structure described above, wherein the internal bleed air duct is capable of leading air at a preset temperature and at a preset pressure from an engine of the aircraft. Therefore, as mentioned above, the small-flow gas leakage of the internal gas guiding pipeline can be detected quickly and accurately, and the safety performance of the airplane is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a gas leak detector according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the venting end of the gas leak detector of FIG. 1;

FIG. 3 is a schematic structural view of a bleed air line configuration provided by an embodiment of the present invention, wherein a gas leak detection assembly provided by an embodiment of the present invention is shown;

figure 4 is a cross-sectional schematic view of one location of the bleed air duct structure of figure 3.

Detailed Description

In the following detailed description of the embodiments, reference is made to the accompanying drawings, which form a part hereof. The drawings show, by way of example, specific embodiments in which the invention may be practiced. The embodiments shown are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. With respect to the drawings, directional terminology, such as "lower," "upper," "left," "right," etc., is used with reference to the orientation of the drawings as described. Because components of embodiments of the present invention can be implemented in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

As shown in fig. 1, the gas leakage detecting element 13 of the present invention includes a housing 1 and a detecting element 2, wherein the housing 1 includes a gas collecting chamber 3, the gas collecting chamber 3 includes a gas inlet 4 and a gas outlet 5, the gas outlet 5 is provided with a gas outlet switch structure, the detecting element 2 extends into the gas collecting chamber 3 to detect the leaking gas entering the gas collecting chamber 3 from the gas inlet 4, the gas outlet switch structure is in a closed state, and the gas outlet switch structure can be opened to switch from the closed state to the open state when the pressure of the leaking gas entering the gas collecting chamber 3 reaches a preset opening pressure value.

In the technical scheme, because the exhaust end 5 of the gas collection cavity 3 is provided with the exhaust switch structure, and the exhaust switch structure is opened when the pressure of the leaked gas entering the gas collection cavity 3 reaches a preset opening pressure value, so that the gas collection cavity 3 has a gas storage function in the practical use of the gas leakage detection member, that is, the exhaust switch structure is in a closed state, at the moment, external air cannot enter the gas collection cavity 3, when the leaked gas with small flow rate starts to flow into the gas collection cavity 3 from the gas inlet end 4, the leaked gas cannot be discharged to the external environment from the closed exhaust switch structure, and when the gas pressure in the gas collection cavity 3 does not reach the preset opening pressure value, the exhaust switch structure can be in a closed state all the time, thereby avoiding the interference of the external environment on leakage detection, and the gas collection cavity 3 can guide the leaked gas to be stored in the gas collection cavity 3, along with the leakage, the leakage gas entering the gas collecting cavity 3 is rapidly increased, so that the gas pressure in the gas collecting cavity 3 is increased, for example, the leaked superheated gas can be rapidly accumulated in the gas collecting cavity to reduce the heat loss of the superheated air, at this time, the detection element 2 extending into the gas collecting cavity 3 can easily sense the leakage gas such as the superheated gas, so that the sensing precision is improved, the sensing time is shortened, and when the gas pressure is increased to a preset opening pressure value, the exhaust switch structure is opened to exhaust the gas. Thus, the gas leakage detecting member 13 can detect a gas leakage of a small flow rate quickly and accurately. Of course, the gas leakage detection piece provided by the invention can detect the gas leakage with large flow rate more quickly and accurately.

In the gas leakage detecting member, the exhaust switch structure may be a one-way opening structure, i.e., a structure that opens in the exhaust direction, or the exhaust switch structure may be a two-way opening structure, i.e., a structure that opens in the exhaust direction and in the direction opposite to the exhaust direction.

In addition, in the gas leak detector, the detection element 2 may be provided as a separate accessory on the housing 1 and extend into the gas collecting chamber 3 when in use, or the detection element 2 may be mounted on the housing 1, for example, to form an assembly with the housing 1.

In addition, the detecting element 2 can extend into the gas collecting cavity 3 from any position to detect the leakage gas entering the gas collecting cavity 3. For example, in the configuration of fig. 1, the detecting element 2 may extend into the gas collecting chamber 3 from the upper side wall or the lower side wall of the housing 1, or the detecting element 2 may extend into the gas collecting chamber 3 from the upper side wall of the housing 1 and then extend out from the lower side wall.

In an alternative embodiment, referring to fig. 1, the detecting element 2 passes through the exhaust switch structure and the exhaust end 5, so that the exhaust channel or the exhaust port of the exhaust end 5 and the structure of the exhaust switch structure can be fully utilized to arrange the detecting element 2, and thus, an additional through hole for installing the detecting element 2 can be omitted from the housing 1, which improves the housing integrity and the air tightness of the housing 1.

Of course, in this gas leak detection member 13, the exhaust switch structure may be provided in the exhaust passage in the exhaust port 5, or the exhaust switch structure may be located outside the exhaust port 5 and connected at a port of the exhaust port 5, for example, the exhaust switch structure may be a check valve whose valve gas inlet end and a port of the exhaust port 5 are connected, such as screwed.

In this gas leak detector, the detecting member 2 may axially pass directly through the exhaust passage while being spaced apart from the inner surface of the exhaust passage for ventilation, that is, a support structure may not be provided between the detecting member 2 and the exhaust passage. Alternatively, in an alternative embodiment, referring to fig. 1 and 2, a support structure having an exhaust gap 6 is provided in the exhaust passage of the exhaust end 5, and the detection element 2 is passed through and supported by the support structure, such that the detection element 2 may be supported in place by the support structure while passing through the exhaust passage, and the exhaust gap 6 may be used for exhaust. In addition, the support structure in the exhaust passage can change the flow direction of the leaked gas, so that the path and the residence time of the leaked gas in the gas collecting cavity are longer, for example, when the leaked gas is high-temperature gas such as high-temperature and high-pressure gas of an engine of an airplane, the structure can reduce the heat loss of the leaked gas, can fully utilize the heat of the leaked gas, and enables the detection element 2 to detect the leakage more easily.

In addition, it should be noted that the support structure may have various configurations, for example, in the first configuration of the support structure, the support structure may be a support plate, the support plate is formed with a central hole as a plurality of air holes arranged around the central hole, wherein the detecting element 2 is fitted through the central hole, and the plurality of air holes may be used for exhausting air as the exhaust space 6. Alternatively, in the second structural form of the support structure, the support structure includes a plurality of support bars arranged at intervals in the circumferential direction, the radially outer end of each support bar is connected to the inner surface of the exhaust passage, and the radially inner end of each support bar is connected to the detecting element 2, so that the detecting element 2 is supported and positioned in the middle of the exhaust passage. Alternatively, in a third structural form of the support structure, referring to fig. 1 and 2, the support structure includes a radial rib 7 having a predetermined axial length, a plurality of the radial ribs 7 are circumferentially spaced, a radially inner side of the plurality of the radial ribs 7 supports the detecting element 2, and an exhaust space 6 is formed between adjacent radial ribs 7. The number of the radial ribs 7 can be selected according to actual requirements, for example, three radial ribs 7 or four radial ribs 7 shown in fig. 2 are provided, so that a plurality of radial ribs 7 arranged at intervals in the circumferential direction, for example, a plurality of radial ribs 7 uniformly distributed at intervals in the circumferential direction of the exhaust passage, can support and position the detection element 2 on the central axis of the exhaust passage, and since the plurality of radial ribs 7 respectively have a predetermined axial length, as can be clearly seen in fig. 1, the support contact area of each radial rib 7 and the detection element 2 can be increased, and the detection file 2 can be more stably supported and positioned. In addition, the interval between adjacent radial ribs 7 is defined as the exhaust interval 6.

In addition, in another embodiment, referring to fig. 1, the exhaust switch structure includes an exhaust core 8 that moves axially, wherein the probe element 2 passes through the exhaust core 8, the exhaust core 8 being able to move axially on the probe element 2 to switch between the off state and the on state. In this way, since the detecting element 2 passes through the exhaust core 8, when the exhaust core 8 moves axially on the detecting element 2, the detecting element 2 can play a role in guiding the movement of the exhaust core 8, and meanwhile, the exhaust core 8 can also play a role in supporting and positioning the detecting element 2, so that the detecting element 2 can be positioned more stably and reliably and the exhaust core 8 can move more stably through the interaction between the exhaust core 8 and the detecting element 2.

Of course, it is understood herein that the vent core 8 may have a variety of shapes, for example, the vent core 8 may be directly a plate-like vent baffle, referring to fig. 1, or the vent core 8 may have other shapes than a flat plate, for example, the vent core 8 may be a cylindrical vent plug.

In addition, in the gas leakage detecting member, as described above, the exhaust switch structure may be provided in the exhaust passage of the exhaust port 5, or may be provided on the port of the exhaust port 5 which is located outside the exhaust port 5 and connected thereto as a separate component.

For example, referring to fig. 1, in one embodiment, the exhaust switch structure comprises an elastic member 9, an exhaust core 8 and the elastic member 9 are arranged in an exhaust passage of the exhaust end 5, and an exhaust port 10 is formed on a passage wall of the exhaust passage, wherein, in a closed state, the exhaust core 8 interrupts the gas collecting cavity 3 and the exhaust port 10, and in an open state, the gas collecting cavity 3 and the exhaust port 10 are communicated. Thus, in actual use, when there is no leaking gas, or the leaking gas entering the gas collecting chamber 3 is not enough to push the exhaust core 8 to move, the exhaust core 8 will be in a closed state, such as the position shown in fig. 1, at which time the passage between the gas collecting chamber 3 and the exhaust port 10 is blocked by the exhaust core 8, at which time the gas collecting chamber 3 can accumulate leaking gas, and when the accumulated leaking gas increases, so that the gas pressure in the gas collecting chamber 3 increases to a preset opening pressure value, the accumulated leaking gas in the gas collecting chamber 3 will push the exhaust core 8 to move from left to right in the graphical interface of fig. 1, so as to connect the gas collecting chamber 3 and the exhaust port 10 for through-flow, at which time the accumulated leaking gas in the gas collecting chamber 3 will be exhausted through the exhaust port 10.

Of course, the number of the exhaust ports 10 may be selected according to actual requirements, for example, the number of the exhaust ports 10 may be one, or may be multiple, for example, multiple exhaust ports 10 are circumferentially spaced, or multiple exhaust ports 10 are spaced in a spiral direction, at this time, if the leaked gas pushes the exhaust core 8 to communicate 1 exhaust port 10 for exhausting, if the amount of the leaked gas continues to increase, the exhaust core 8 is pushed to continue to move, and the next exhaust port 10 may be communicated to increase the exhaust amount.

In addition, in the gas leakage detecting member, the inner dimension of the gas collecting chamber 3 may be the same as the inner dimension of the gas inlet passage of the gas inlet end 4. Alternatively, in an alternative embodiment, and with reference to fig. 1, the internal dimensions of the gas collection chamber 3 are greater than the internal dimensions of the gas inlet passage of the gas inlet end 4. In this way, after the leaked gas enters the large-sized gas collecting cavity 3 from the small-sized gas inlet 4, since the internal size of the gas collecting cavity 3 is increased, for example, the internal space of the gas collecting cavity 3 is much larger than the gas inlet channel of the gas inlet 4, for example, the volume of the gas collecting cavity 3 is 3-8 times of the gas inlet channel, the pressure of the leaked gas entering the gas collecting cavity 3 can be reduced, so that the gas pressure can be further stabilized, and the leaked gas can further sufficiently contact the detection element 2, such as the leakage detection line 11 described below, in the gas collecting cavity 3.

In addition, in the gas leakage detector 13, a connecting structure such as a connecting base or a connecting rod may be provided on the housing 1 so as to connect and mount the gas leakage detector to a desired mounting base through the connecting structure, or, referring to fig. 1 and 4, the gas inlet 4 may be used as a connecting and mounting portion of the gas leakage detector, so that the gas inlet 4 may be connected to the mounting base such as the vent bracket 12 or the second tube 22 described below when the gas leakage detector is mounted for use. Thus, the gas inlet end 4 may serve as a connection mounting portion or a gas inlet portion for leaking gas.

In addition, in the gas leakage detecting member, the number of the exhaust ends 5 may be one or more, and the arrangement position of the exhaust ends 5 may be located at any position of the housing 1 according to actual requirements. For example, referring to fig. 1, in one embodiment, the gas collecting chamber 3 includes exhaust ends 5 arranged at intervals on the same axis, for example, the housing 1 may be a structure with a cylindrical middle and conical ends, and the exhaust ends 5 may be formed on the small end of the conical cylinder, each exhaust end 5 is provided with an exhaust switch structure, the detecting element 2 is a leakage detecting line 11, and the leakage detecting line 11 extends into the gas collecting chamber 3 and extends out of the gas collecting chamber 3. For example, the leakage detection line 11 may extend into the gas collecting chamber 3 from the exhaust end 5 and the exhaust switch structure at one end, and then penetrate out from the exhaust end 5 and the exhaust switch structure at the other end, so that the line segment of the leakage detection line 11 located in the gas collecting chamber 3 is located on the central axis position of the gas collecting chamber 3, and thus, the leakage gas can be better and uniformly contacted for rapid and accurate detection. For example, in the process of leading out high-temperature and high-pressure gas of an aircraft engine, leaked high-temperature and high-pressure gas can enter the gas collecting cavity 3 from the gas inlet end and contact the leakage detection line 11 after being gathered in the gas collecting cavity 3, so that the resistance value of the leakage detection line is changed, and the leakage alarm is triggered.

Of course, the detecting member 2 may be other members capable of detecting gas leakage, for example, a smoke sensor or the like, in addition to the leakage detecting wire 11.

In addition, the present invention provides a gas leak detection assembly, referring to fig. 3, comprising a vent bracket 12 and a gas leak detector 13 as described in any of the above, wherein the vent bracket 12 is adapted to be disposed in a vent gap 16 between a sleeved inner gas conduit 14 and an outer heat insulating wrapping 15 when assembled, the vent bracket 12 comprises a bracket gas inlet 17 adapted to communicate with the vent gap 16 and a bracket gas outlet 18 adapted to communicate with the bracket gas inlet 17, and the gas inlet 4 of the gas leak detector 13 communicates with the bracket gas outlet 18.

Thus, in use, the vent bracket 12 is disposed in the vent gap 16 between the inner gas conduit 14 and the outer insulating coating 15, and when a leak occurs in the inner gas conduit 14, the leaking gas flows in the vent gap 16, through the bracket gas inlet 17 and the bracket gas outlet 18, into the gas inlet end 4, and then into the gas collection chamber 3 for accumulation in the gas collection chamber 3, so that, as described above, the gas leak detection assembly can quickly and accurately detect a small flow rate of gas leaking from the inner gas conduit by any of the gas leak detection members described above.

In addition, in actual use of the gas leak detection assembly, the vent support 12 may extend into the vent gap 16 and be radially spaced from the inner vent line 14. Alternatively, in an alternative embodiment, the vent support 12 includes a radially inner end in supporting connection with the inner air conduit 14 during assembly and a radially outer end in supporting connection with the outer insulating coating 15 such that the vent support 12 will be in supporting connection between the inner air conduit 14 and the outer insulating coating 15 during assembly with the support air inlet 17 formed in a side surface of the vent support 12 and the support air outlet 18 formed in an end surface of the radially outer end. Like this, the support 12 of ventilating is in the time of being convenient for lead the leakage gas to income gas end 4, can also play the supporting role to gas leakage detection piece 13, that is, this support 12 of ventilating plays the effect of support and air guide simultaneously to need not setting up other extra support fixed knot and construct, thereby simplify structural configuration, reduced weight. In addition, since the holder gas inlet 17 is formed on the side surface of the ventilating holder 12 and the holder gas outlet 18 is formed on the end surface of the radially outer end, a turning flow path of the gas is formed between the holder gas inlet 17 and the holder gas outlet 18, so that the leaking gas is turned inside the ventilating holder 12, and therefore, the dynamic pressure of the leaking gas can be primarily reduced by the resistance of the turning.

Of course, the vent bracket 12 may be welded or screwed to the inner vent line 14.

In addition, in the gas leakage detecting assembly, the gas inlet end 4 and the holder gas outlet 18 may be directly connected.

Alternatively, referring to fig. 3 and 4, the gas leak detection assembly includes a gas conduit 19 having a turning corner, wherein the inlet of the conduit of the gas conduit 19 is connected to the outlet 18 of the holder and the outlet of the conduit of the gas conduit 19 is connected to the inlet end 4. Thus, the gas guide tube 19 can support the gas leakage detector 13 while guiding the leaked gas to the gas inlet end 4, that is, the gas guide tube 19 can simultaneously support and guide the leaked gas, so that the use of an additional support to support the gas leakage detector 13 can be avoided, and the overall weight of the gas leakage detector assembly is reduced.

In addition, the turning corners of the air duct 19 can perform the turning and pressure reducing effects on the leakage, and the number of the turning corners can be one or more, and can be a right angle shape, an arc shape or other shapes. For example, in practical use, after the gas in the inner gas guiding pipeline 14 leaks, the leaked gas enters the gas guiding pipe 19 through the ventilation gap 16, and under the action of the turning corner, the leaked gas turns in the gas guiding pipe, and due to the influence of the resistance of the turning corner, such as a right angle, the dynamic pressure of the leaked gas is greatly reduced, so that the flow rate of the gas entering the gas collecting cavity 3 is greatly reduced, and the detection element 2, such as the leakage detection line 11, can be used for detecting the leaked gas quickly and accurately.

In addition, the bracket air outlet 18 of the ventilation bracket 12 can be connected with the air inlet end 4 of the gas leakage detection piece 13 or the pipe air inlet of the air guide pipe 19 in a threaded connection or a welding connection, and when the threaded connection is adopted, the disassembly and the assembly are convenient.

In addition, in the gas leakage detecting assembly, the gas guide tube 19 may have various shapes, for example, an L-shaped tube, or, referring to fig. 3 and 4, the gas guide tube 19 includes a first tube body 21 and a second tube body 22 which are communicated with each other, wherein a tube inlet of one end of the first tube body 21 is connected to the holder gas outlet 18, and the other end of the first tube body 21 is connected to a tube side wall of the second tube body 22 to form a turning corner at the junction to divert the gas in the second tube body 22 toward both ends to form a tube similar to a T-shaped tube, of course, the tube sections of the second tube body 22 at both ends of the first tube body 21 may be the same or different, and tube outlet ports at both sides of the first tube body 21 in the axial direction are provided on the tube side wall of the second tube body 22, and each tube outlet port is connected to the gas inlet 4 of the respective gas leakage detecting members, for example, two gas leakage detecting members 13 respectively located at both ends of the first tube body 21 are connected to the second tube body 22, as shown in fig. 3 and 4. Thus, for example, in practical use, after the gas in the internal gas guiding pipeline 14 leaks, the gas will enter the first tube 21 and the second tube 22 through the ventilation gap 16, and will be diverted and turned for a plurality of times, and due to the diverting function and the effect of the resistance of the turning corner, such as a right angle, the dynamic pressure of the leaking gas is greatly reduced, which further reduces the gas flow rate entering the gas collecting cavity 3, and further facilitates the detection element 2, such as the leakage detection line 11, to quickly and accurately detect the leaking gas.

In addition, the present invention provides an air-entraining pipeline structure, referring to fig. 3 and 4, which includes an inner air-entraining pipeline 14, an outer heat-insulating wrapping 15 and a gas leakage detecting assembly as described in any of the above, wherein the outer heat-insulating wrapping 15 is fitted around the outer portion of the inner air-entraining pipeline 14 and forms a ventilation gap 16 between the outer heat-insulating wrapping 15 and the inner air-entraining pipeline 14, the outer heat-insulating wrapping 15 insulates the inner air-entraining pipeline 14, a ventilation bracket 12 is disposed in the ventilation gap 16, and a bracket air-entraining port 17 communicates with the ventilation gap 16. For example, in one embodiment, the radially inner end of the vent support 12 is supported and connected to the inner vent line 14, while the radially outer end of the vent support 12 is supported and connected to the outer insulating wrap 15.

As described above, in the bleed air duct structure, when a leak such as a lower flow rate leak occurs in the inner bleed air duct 14, the leaking gas flows in the vent gap 16 and then flows into the vent frame 12, so that the gas leak detecting unit can quickly and accurately detect a small flow rate gas leak from the inner bleed air duct by any of the gas leak detecting members described above.

Finally, the invention provides an aircraft, for example a civil aircraft such as a passenger aircraft, comprising the bleed air duct structure 20 described above, wherein the internal bleed air duct 14 is capable of leading air from the engines of the aircraft at a preset temperature and at a preset pressure, for example at a high temperature and pressure. Therefore, as mentioned above, the small-flow gas leakage of the internal gas guiding pipeline can be detected quickly and accurately, and the safety performance of the airplane is improved.

It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. Any reference signs in the claims shall not be construed as limiting the scope. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims (15)

1. A gas leakage detection piece is characterized by comprising a shell (1) and a detection element (2), wherein the shell (1) comprises a gas collection cavity (3), the gas collection cavity (3) comprises a gas inlet end (4) and a gas outlet end (5), the gas outlet end (5) is provided with a gas outlet switch structure, the detection element (2) extends into the gas collection cavity (3) to be used for detecting leakage gas entering the gas collection cavity (3) from the gas inlet end (4), the gas outlet switch structure is in a closed state, and the gas outlet switch structure can be opened to be converted from the closed state to an open state when the pressure of the leakage gas entering the gas collection cavity (3) reaches a preset opening pressure value.

2. Gas leak detector according to claim 1, characterized in that the detection element (2) passes through the exhaust switch structure and the exhaust end (5).

3. Gas leak detector according to claim 2, characterized in that a support structure with a venting gap (6) is arranged in the venting channel of the venting end (5), through which support structure the detector element (2) is passed and supported.

4. The gas leak detector according to claim 3, wherein the support structure includes a plurality of radial ribs (7) having a predetermined axial length, the plurality of radial ribs (7) being circumferentially spaced apart, a radially inner side of the plurality of radial ribs (7) supporting the detector element (2), the exhaust gap (6) being formed between adjacent radial ribs (7).

5. Gas leak detector according to any one of claims 2-4, characterized in that the venting switch arrangement comprises an axially movable venting core (8), wherein the detector element (2) passes through the venting core (8), the venting core (8) being axially movable on the detector element (2) for switching between the closed state and the open state.

6. The gas leak detector according to claim 5, wherein the exhaust switch structure comprises an elastic member (9), the exhaust core (8) and the elastic member (9) are arranged in an exhaust channel of the exhaust end (5), an exhaust port (10) is formed on a channel wall of the exhaust channel, wherein in the closed state, the exhaust core (8) blocks the gas collection chamber (3) and the exhaust port (10) from flowing, and in the open state, the gas collection chamber (3) and the exhaust port (10) are through-flowed.

7. Gas leak detector according to claim 1, characterized in that the gas collecting chamber (3) has an inner dimension which is larger than the inner dimension of the gas inlet channel of the gas inlet end (4).

8. The gas leak detector according to claim 1, wherein the gas inlet end (4) serves as a connection mounting for the gas leak detector.

9. The gas leak detector according to claim 1 or 2, wherein the gas collecting chamber (3) comprises the exhaust ends (5) arranged at intervals on the same axis, each exhaust end (5) is provided with the exhaust switch structure, the detecting element (2) is a leak detection line (11), and the leak detection line (11) extends into the gas collecting chamber (3) and extends out of the gas collecting chamber (3).

10. A gas leak detector assembly comprising a gas vent support (12) and a gas leak detector (13) as claimed in any of claims 1 to 9, wherein the gas vent support (12) is adapted to be positioned in a gas vent gap (16) between a nested inner gas inlet conduit (14) and an outer insulating coating (15) when assembled, the gas vent support (12) comprising a support gas inlet (17) adapted to communicate with the gas vent gap (16) and a support gas outlet (18) adapted to communicate with the support gas inlet (17), the gas inlet (4) of the gas leak detector (13) communicating with the support gas outlet (18).

11. The gas leak detection assembly of claim 10, wherein the vent bracket (12) includes a radially inner end in supporting connection with the inner vent line (14) and a radially outer end in supporting connection with the outer insulating wrap (15) when assembled, the bracket air inlet (17) being formed on a side surface of the vent bracket (12), and the bracket air outlet (18) being formed on an end surface of the radially outer end.

12. The gas leak detection assembly according to claim 10 or 11, comprising a gas duct (19) having a turning corner, wherein the tube inlet of the gas duct (19) is connected to the holder outlet (18) and the tube outlet of the gas duct (19) is connected to the inlet end (4).

13. The gas leak detection assembly according to claim 12, wherein the gas guide tube (19) comprises a first tube body (21) and a second tube body (22) which are communicated with each other, wherein a tube gas inlet at one end of the first tube body (21) is connected with the bracket gas outlet (18), the other end of the first tube body (21) is connected with a tube side wall of the second tube body (22) to form a turning corner at the joint, the tube side wall of the second tube body (22) is provided with the tube gas outlets which are positioned at two sides of the first tube body (21) in the axial direction, and each tube gas outlet is connected with the gas inlet end (4) of the gas leak detection member corresponding to the tube gas outlet.

14. A bleed air duct construction, comprising an inner bleed air duct (14), an outer insulating wrap (15) and a gas leak detection assembly according to any of claims 10 to 13,

the outer heat-insulating wrapping layer (15) is sleeved outside the inner air guide pipeline (14) and a ventilation gap (16) is formed between the outer heat-insulating wrapping layer (15) and the inner air guide pipeline (14), the ventilation bracket (12) is arranged in the ventilation gap (16), and the bracket air inlet (17) is communicated with the ventilation gap (16).

15. An aircraft, characterized by comprising a bleed air line arrangement (20) as claimed in claim 14, wherein the internal bleed air line (14) is capable of leading out gas of a preset temperature and a preset pressure from an engine of the aircraft.

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